Mine drill



` Bec. i8 1923. LIWQM@ G. DOBSON- 4 MINE DRILL Filed Aug. 19. 1921 2 Sheets-Sheet 3 Dec.' 18 1923.

hmmm@ G. DOBSON MINE DRILL Filed Aug. 19. 1921 2 Sheets-Shea?l 2' ,17 2f 26 @766' az Patented Dec. 18, 1923.

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encuen Bonson, or snee, Uran.

Minis Darrin Application filed August 19, 1921.

To all whom t may concern.'

Be it known that l, Grenen DonsoN, a citizen of the United States, residing at Sego, in the county of Emery, State of Utah, have invented certain new and useful linproveinents in Mine Drills.; and l do hereby declare the 'following to be a i'ull, clear, and exact description ot the invention, such as will enable others skilled in the art to which it appertains to inake and use the same.

This invention relates to mine drills and it has for its object to provide a structure` that will be extremely light so that it may be readily transported from one place ot use to another and which may be readily shifted both vertically and horizontally to make cuts' in a corresponding variety of directions from the support.r A further object of the invention is to provide a structure in which the drill and its motor may b-e readily shifted bodily in a vertical direct-ion and in which the mechanism in all of its various adjusted positions may be held securely in whatever of its adj usted positions the motor with its drill may be. ther objects and advantages of the invention will be understood from the following description.

In the drawings:

Figure 1 is a side elevation showing a drill embodying the present invention set up in position for use.

Figure 2 is atop plan view of the equipment shown in Figure 1.

Figure 3 is a section on line 3--3 of Figure 1, showing the manner ot mounting the supporting arm to permit of vertical swing and showing the ina-nner of holding the supporting arm bracket at different points of its adjustment vertical of the supporting column.

Figure 4 is a sect-ion on line 4;*41 ot Figure 1, showing the manner of holding the supporting arni in different posit-ions of its vertical swinging movement.

Generally speaking, the present drill comprises a motor designed to receive various drills interchangeably and which motor is slidably mounted upon a supporting arm so that it may be advanced to and from the face to be drilled. This arm is pivoted at one end to a bracket that in turn is adjustably connected to a supporting column, the connection of the arm with the bracket permitting its free end to be raised and lowered so as to correspondingly position the motor with its drill.

Serial No. 493,687.

Referring to the drawings, the supporting column includes an upper rectangular bar 10, the lower end portion of which is threaded as shown at 11 and slidably disposed within a base 12. A hand wheel 13 rests upon the upper end of the base and engages the threads 11 so that by adjustment ot' this hand wheel, the bar 10 may be raised and lowered in the base, thus to irmly position the base against the floor of the tunnel or chamber, as the oase may be and to correspondinglT position the upper end ot the bar against the roof. The base is provided with the projections illustrated, to prevent slipping'.

Upon the .bar 10 of a column is mounted a U-shaped bracket comprising the spaced legsV 14 and 15 and the connecting blight portion 16, through which latter is formed a rectangular opening 17 that slidably receives the bar of the supporting column. Through the bracket at one side of the opening 17 is a threaded perforation 18 in which is engaged a set screw 19, designedto engage interchangeably the depressions 2O in the bar'10, Y

Through the legs 111 and 15, midway between the bight 1G and the free ends of the legs are formed registering openings 21 and 22 that receive a. pivot bolt 23 that is engaged also through the disc 24: yat one end orn a. supporting arm 25. The disc 24: is provided with an arcuate series of perforations 2G, which series is concentric to the disc and extends the same angular distance both above and below the arm. lt. will be noted upon reference to Figure 1 of the drawings that the supporting bracket is of considerable vertical extent, which extent is equal approximately to the diameter of the disc 24 and through these legs ot the bracket are formed the upper and lower pertorations 27 and 28 respectively, either of which may receive a locking pin 29 passed also through a perforation 26. Nhen the supporting arm is swung downwardly on its pivot bolt 23, the pin is operated in the lower perforation 28 and when the supporting arm is swung downwardly from horizontal position on its pivot bolt 23, the pin 29 is operated in the lower perforation 28 and when the arm is swung upwardly, the pin is operated in the upper perforation 27, as will be understood.

The arm 25 serves as a direct support for a motor base 30 having a rectangular passage 31 through it and in which is slidingly received the arm 25 that is rectangular in cross. section and thus serves to permit of adjustment of the base longitudinallyof it,

which the motor with the base'may be slidV crwardly and rearwardly along the supporting arm. l

The motor shait 3S is provided With a chuck 39, of any approved type, to permit oi coupling of drills 40 quickly and interchangeably Witha motor shailft.

lVith the present construction, it will be understood that .with the parts assembled in the manner described, the column is set up in thevproper angular relation to the jface to be drilled, after which the bracket is adjusted vertically of the column and held at the desired point through the medium of the set screw 19. The supporting arm 25 is then Vswung on its pivot bolt 23 to adjust the motor with its drill in a vertical plane so that the drill Will be presented to the aceof the Work at the desired angle. The circuit of the motor being then closed, the drill is Vactuated and is pressed against 'the Work by shoving on the handle grip 37. Then the drilling has proceeded to 'the proper depth, the motor With the drill is drawn rearwardly of the supporting arm and another drill is substituted, after Which the motor Vis again shoved forwardly to carry the drill into the hole with a continuation of the 'drilling operation. This is continuedVV until the hole has been drilled durability andinsures firmness of the drill 1 and extreme ease of its operation.

It will be noted thatat the Jfree end. of the arm 25 is a perforation inwhich is received a cotter pinithat prevents acci- Y dental increment of the motor-base cti from the arm. lt will be noted, further, that by reason of the fact that Vthe arm is square in cross-section and the passage through the motor base is of the same shape, 'the motor may be set-above, below or at either side of the supporting arm. f

What is claimed is: Y Y

A mine drill stand comprising the combination with a supporting column having a series of notches in one of its longer edges, and a platform for supporting a drill motor, of a housing having a verticall opening re ceiving the column therethroughand having a screw engageable in the .said notches, the housing being bifurcated throughout the greater part of its length and formed With transverse central aligned pivot openings p for the pivot of the platform-and a circular series of openings concentric with the pivot openings for the reception of a pin carriedV 

